ALIF EXPLORATION
Selected Variables
base: Code of the patient
covariates:
- Age
- Gender
- Prior Spine Surgery
- '1st surgeon: experience in ASD surgery'
- ASA classification
- Decompression
- Osteotomy
- 3CO
- SPOs
- BMI_First Visit
- Tobacco use_First Visit
- Osteoporosis / osteopenia
- Levels Previously operated - Lower
- LGap
- RLL
- RSA
- RPV
- Cobb LS curve (Degree)
- Number of Interbody Fusions
- 'Posterior Instrumented Fusion: Upper / Lower Levels'
- Alif
- LL-Lordosis Difference
outcomes_ql:
- 2Y. ODI - Score (%)
- 2Y. SRS22 - SRS Subtotal score
- 2Y. SF36 - MCS
- 2Y. SF36 - PCS
outcomes_radiology:
- 6W. Major curve Cobb angle
- 1Y. Major curve Cobb angle
- 6W. T1 Sagittal Tilt
- 1Y. T1 Sagittal Tilt
- 6W. Sagittal Balance
- 1Y. Sagittal Balance
- 6W. Global Tilt
- 1Y. Global Tilt
- 6W. Lordosis (top of L1-S1)
- 1Y. Lordosis (top of L1-S1)
- 6W. LGap
- 1Y. LGap
- 6W. Pelvic Tilt
- 1Y. Pelvic Tilt
predictive:
- Weight (kgs)_First Visit
- Height (cm)_First Visit
- Total surgical time st1+st2+st3
- Osteotomy
- Alcohol/drug abuse
- Anemia or other blood disorders
- Osteoarthritis
- Mild vascular
- Depression / anxiety
- Diabetes with end organ damage
- Cardiac
- Hypertension
- Chronic pulmonary disease
- Nervous system disorders
- Renal
- Peripheral vascular disease
- Psychiatric / Behavioral
- Peptic ulcer
- Bladder incontinence
- Bowel incontinence
- Leg weakness
- Loss of balance
- NRS back - Leg pain - Average
- Tobacco use_First Visit
- Years with spine problems
- ODI - Score (%)_First Visit
- SRS22 - SRS Total score_First Visit
- SF36 - PCS_First Visit
- SF36 - MCS_First Visit
- Major curve Cobb angle
demographic:
- Age
- Gender
- Prior Spine Surgery
- ASA classification
- 3CO
- BMI_First Visit
- Global Tilt
- Ideal LL
- Lordosis (top of L1-S1)
- ODI - Score (%)_First Visit
- SRS22 - SRS Total score_First Visit
- SF36 - PCS_First Visit
- SF36 - MCS_First Visit
- Major curve Cobb angle
expanded:
- Age
- Gender
- Prior Spine Surgery
- '1st surgeon: experience in ASD surgery'
- ASA classification
- Decompression
- Osteotomy
- 3CO
- SPOs
- BMI_First Visit
- Tobacco use_First Visit
- Osteoporosis / osteopenia
- Levels Previously operated - Lower
- LGap
- RLL
- RSA
- RPV
- Cobb LS curve (Degree)
- Number of Interbody Fusions
- 'Posterior Instrumented Fusion: Upper / Lower Levels'
- Alif
- LL-Lordosis Difference
- Weight (kgs)_First Visit
- Height (cm)_First Visit
- Total surgical time st1+st2+st3
- Alcohol/drug abuse
- Anemia or other blood disorders
- Osteoarthritis
- Mild vascular
- Depression / anxiety
- Diabetes with end organ damage
- Cardiac
- Hypertension
- Chronic pulmonary disease
- Nervous system disorders
- Renal
- Peripheral vascular disease
- Psychiatric / Behavioral
- Peptic ulcer
- Bladder incontinence
- Bowel incontinence
- Leg weakness
- Loss of balance
- NRS back - Leg pain - Average
- Years with spine problems
- ODI - Score (%)_First Visit
- SRS22 - SRS Total score_First Visit
- SF36 - PCS_First Visit
- SF36 - MCS_First Visit
- Major curve Cobb angle
- SRS22 - SRS Subtotal score_First Visit
- T1 Sagittal Tilt
- Sagittal Balance
- Global Tilt
- Lordosis (top of L1-S1)
- Pelvic TiltAge
Proportion of na: 0% 
Gender
Proportion of na: 0%| Female | Male | |
|---|---|---|
| No | 290 | 75 |
| Yes | 38 | 11 |
Prior Spine Surgery
Proportion of na: 0%| No | Yes | |
|---|---|---|
| No | 235 | 130 |
| Yes | 23 | 26 |
1st surgeon: experience in ASD surgery
Proportion of na: 0%| 2-10 years | More than 10 years | |
|---|---|---|
| No | 89 | 276 |
| Yes | 5 | 44 |
ASA classification
Proportion of na: 0.4% 
Decompression
Proportion of na: 0%| No | Yes | |
|---|---|---|
| No | 202 | 163 |
| Yes | 31 | 18 |
Osteotomy
Proportion of na: 0%| No | Yes | |
|---|---|---|
| No | 159 | 206 |
| Yes | 13 | 36 |
3CO
Proportion of na: 0%| No | Yes | |
|---|---|---|
| No | 324 | 41 |
| Yes | 33 | 16 |
SPOs
Proportion of na: 0% 
BMI_First Visit
Proportion of na: 1.2% 
Tobacco use_First Visit
Proportion of na: 2.6%| Current | Ex-User | NA | Non-User | |
|---|---|---|---|---|
| No | 60 | 65 | 9 | 231 |
| Yes | 8 | 11 | 2 | 28 |
Osteoporosis / osteopenia
Proportion of na: 0%| No | Yes | |
|---|---|---|
| No | 286 | 79 |
| Yes | 41 | 8 |
Levels Previously operated - Lower
Proportion of na: 63.7%| C | Iliac | L | NA | S | T | |
|---|---|---|---|---|---|---|
| No | 6 | 5 | 74 | 238 | 36 | 6 |
| Yes | 0 | 4 | 14 | 26 | 5 | 0 |
LGap
Proportion of na: 1.9% 
RLL
Proportion of na: 1.9% 
RSA
Proportion of na: 3.1% 
RPV
Proportion of na: 1.6% 
Cobb LS curve (Degree)
Proportion of na: 0% 
Number of Interbody Fusions
Proportion of na: 0% 
Posterior Instrumented Fusion: Upper / Lower Levels
Proportion of na: 0%| Iliac+S | L | T | |
|---|---|---|---|
| No | 258 | 104 | 3 |
| Yes | 43 | 6 | 0 |
LL-Lordosis Difference
Proportion of na: 1.9% 
Propensity Scores Common Support
Model Stats
- Treatment proportion: 0.118
- Model Type: elastic_net
- Accuracy: 0.9004869
- Params: alpha: 0.4230769 lambda: 0.0081362
Model Coefficients
Bootstraping replicas: 200
Visual Inspection
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'
## `geom_smooth()` using formula 'y ~ x'